. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 1. A. Normal larva. Seven hours after fertilization. Shows apical tuft and prototroch. Posterior to the prototroch is the blastoporal indentation. B. Exogastrula. Seven hours. Viewed from posterior end. Shows apical tuft, prototroch, and elongate post-trochal region. C. Normal larva. Thirteen hours. Shows apical tuft, prototroch, posterior cilium, and differentiating gut. D. Exo- gastrula. Thirteen hours. Shows apical tuft, prototroch, posterior cilium, and elongate post-trochal region. Exogastrula (Fig. \D}. This larva
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 1. A. Normal larva. Seven hours after fertilization. Shows apical tuft and prototroch. Posterior to the prototroch is the blastoporal indentation. B. Exogastrula. Seven hours. Viewed from posterior end. Shows apical tuft, prototroch, and elongate post-trochal region. C. Normal larva. Thirteen hours. Shows apical tuft, prototroch, posterior cilium, and differentiating gut. D. Exo- gastrula. Thirteen hours. Shows apical tuft, prototroch, posterior cilium, and elongate post-trochal region. Exogastrula (Fig. \D}. This larva is considerably more elongate, antero-posteriorly, than the normal larva of the same age. The structure of the apical tuft, prototroch, and posterior cilium is normal, and the apical tuft is in the usual location. On the other hand, the relative positions of both the prototroch and the posterior cilium are strikingly different. The former is situated more anteriorly in the larva; the latter is to one side of the larva and projects laterally instead of posteriorly. The general yellow coloration of the embryo does not extend very far beyond the equator; the cells at the posterior end are colorless. The crescent-shaped cavity and the longitudinal canal present in the endoderm cells of the normal larva at this stage are not Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
